topspeed# on 15F? ( inkl. Plate , Intake Airfilter , Freeflow, Impeller, sponsons )

what Topspeed# you guys get with the complete package ? (no SC )

@RC , have you some speed # for your product on the 15F?

will there be a RIVA Stage 1 & Stage 2 for the STX15F ?

This message has been edited. Last edited by: RIVA CREW,

mr racing, what is your speed right now.
what mods you got if any.

My 15F is doing only 61-62 top speed. completely stock.

I tried the 13-19 skat impeller, it increase around 1MPH but the hole shot was crap. I installed the original back again. I like it more.

I have no 15f yet, I m not sure RXP or STX-15F

RXP definitely. You'll be happy, its fast both acceleration and top speed, way faster on top end than the 15f. The RXP also has a reverse mirrors, tow hook. It handles better than the 15f. If your worried about the SC clutch get a blow off valve plus the 06 should have an updated version in them. I have not heard of any other problem with them besides the clutch and that seems to be rare.

No way don't listen to this sea-don't fan the stx15f is defintley the way to go the hole shot is better the RXP weighs about 200 lbs more they ride rough the stx15f will tear it up in rough water the only this the rxp has on the 15f is a little top end speed but other than that it has nothing on the 15f. RXP also cost about $1700 more, i rode both and i am defintley getting a 15f in the spring. O yea did I mention relyability. Sea-doo's always have problems,I mean if you don't want to ride much and would rather have you're machine in the shop than get an RXP but, if you want to ride all season long with no problems the get the 15f with a little money you'll be blowing RXP's away i have a 12f right now and for about $800 I gained between 5-6 MPH im sure with the same mods on a 15f you should be able to gain 4-5 MPH which puts a 15F right up there with an RXP on top end

Green Hornet just wants you to suffer the same seadoo fate that he has. Don't do it. The ONLY thing that the RXPs has on the 15F is top speed (only on smooth water, 15F will stomp the RXP in chop).

The majority of skis at the dealer this weekend for repairs were seadoos...and most of the doos were RXPs.

The 15F has an INCREDIBLE holeshot for a stock boat. The top speed is also respectable. My wife riding her 15F can pull my GPR in heavy chop, they hook up pretty well.

It has the best of everything -reverse, boarding step, lots of storage, can pull skiers legally... and did I mention, GAS! It drinks a LOT less gas than my GPR - 40-50% LESS!

No question, 15F. If you want the top speed and great turning ability, get a GPR. There is a guy in the Yamaha forum getting ready to sell an 05 w/33 hours.

Suffer my fate? Got a SC drive shaft replaced. Mine is a stage 2. Anytime you mod the reliability goes down. But this was due to the person not properly installing the sc impeller. The problem was solved. Yes the sc has been an issue but not as much as you think. Go to any dealer and ask them, goto more than just 1.

They both have great hole shots, its pretty close, but top end, your talking almost 10mph more on the RXP.

Look at the magazine articles about both of the skis. The 15f cannot handle chop as good and its a rough ride.

If you can try and ride both. It's difficult but if you want to make a trip to a dream demo somewhere that is the place to test ride both of them..

The RXP wasn't the hottest selling watercraft for nothing.

I know how you feel, I thought about it as well, I also heard about sea-doo and there reliability problems but that's with the older stuff. The 4tec is new and so far no one has had or heard of engine problems not even close to say GPR's and crankshafts. They built the 4tec to handle 300-400 horsepower. Ask around.

I've always stuck with yamahas, but I decided after awhile to see how the new seadoos held up.
So far they seem tough.

They are heavy and you have to use high octane fuel. The fuel thing might be something to think about. I also thought about a 15f. I really like the colors this year but where I live the water is dominated by yamahas and seadoos. You hardly see any hondas or kawasakis.

If you can try out both.

i raced a 15f with my stx1200r and top end was pretty close. my 1200r gps at 63.5 i would say 15f is around 62.5 or 63.

I have a 1300 GPR Stage I+ now (70.4 mpH). I tested RXPs with RIVA Stage II+ porting , I know the RXP is fast. "

I still think about the 15F, because I can get a 05 for a good price , I race CC as well,

so I just want to know if I can get a 15F to 68-70 on 93 oct. without SC

FYI, I didn't read this in an article - I own a 15F and I can tell you that it is very good in the chop. Goes it ride rough? A little, compared to the bigger, slower yamaha barges, but is smoother than my GPR, thats for sure.

Almost 10mph. I guess if you consider 5mph=almost 10... 15Fs pull 62 pretty much all day long. Not counting the factory "ringers", RXPs usually get 66-67 off the lot. Put them both in some chop and the 15F is going to hang.

It would be nice to get a 68-70 15F with no SC or off-shore kit, but I don't think its going to happen. I can see 65ish being possible. I think most top speed improvements are going to be at the cost of that killer low end. I think it is a very well balanced boat.

I just went ahead and got the go fast boat. I too have a GPR with a stage 2 kit and it doesn't do 70mph. I just got tired of trying to get a ski to go faster. I just bought a fast one.

I'm not knockin the 15f, it looks cool and the holeshot is just like the RXP. Yes it's probably about 2k less but think about the parts you will be buying and how fast it will go in comparision.

The whole thing about speed is really weird, I think. Some days my GPR will beat a stock RXP and some days it won't. But my RXP will now just about beat anything on the water, most not all.

hey guys dont confuse ride with handling
the RXP with the extra weight and deeper v will take the bumps better(ride)ala rolls royce
the 15f will take turns better and has a better feel for whats going on underneath the boat(handling) ala F1
go the 15f, with a few bucks you might not beat the top speed of the rxp but you will have to turn one day oh
yeah 15f has mirrors too
here in Aus the seadoos rule, I suppose theres no one building kawasaki
but at the last nationals we had two or more full on superstock rxps built by the best RXP builders in the world (Les Cooke and Chris Withers) get beaten by one ss xp (handling)

ok here is my 2 cents worth bases on real world that me and my buddies have performed: our rxp is real fast and quick stock gps 68.3,our ultra 150 with all the bolt on mods 68.3, our gp1300r riva stage 2 67.0 gps,the yamaha and ultra are about the same taking off,the rxp is bad ass hole shot and wins every time...but when we ride in chop the yamaha always wins,thats moderate white caps, rxp nose hunts at speed,ultra wants to float side to side ,the yamaha is solid handler but porposes a little, what we need it the rxp motor in the yamaha hull,weighing the same as the ultra...then we would just want more because too much is just right...

quote:

Originally posted by winterstick:at the last nationals we had two or more full on superstock rxps built by the best RXP builders in the world (Les Cooke and Chris Withers) get beaten by one ss xp (handling)

You know us old school XP guys love to hear that kind of stuff


You can get a 15F to do right near 70 with the off shore kit.

quote:

Originally posted by mr racing:
@RC , have you some speed # for your product on the 15F?

will there be a RIVA Stage 1 & Stage 2 for the STX15F ?

We offer only one RIVA pump & handling mod for the 15F. Our Pro-Series Sponsons. Which fit the 12F as well.

At this time we plan to offer a RPM Kit in addition to our Endurance Kit and Supercharger Kit for the 15F.

I have to say my stock class RXP will beat a 15F off the line every time I even beat twins and triple pipe boats off the line at the World Finals on my stock boat.I won both on my stock RXP but I do agree with the Kawi guys on the 15F handling the chop a little better and turning.I think both are reliable because of the 4 Strokes.I have 50 hrs of race time on my stock 05 clutch 30hrs with stock class racing ECU turning 8,400 rpm's.I think either one would be good.Just my opion.

THE 15 F IS a very reliable boat and stays hooked up in a chop the sea doo will not and handles like crap with out mods the 15f stock does 62.4 stock ( what mine is running) with the plate ,intake , air cleaner , prop 64.8 the sea doo stock runs 68.8 stock ( friends) i perfer the 15f do too hole shot ( i have beaten the sea doo off the line stock to stock at many ijsba races ( region 7 ) in 2004 and beaten them in the race also )handling and reliablity plus $1800 or so cheaper and less down time since we all know the sea doo's always break down everyone has there own opinion's and if you want speed get the super charger put on boat will be in the mid 80's

Mitch,

So what your saying is, RXP for Havasu and 15F for Wildwood, NJ?

quote:

Originally posted by kawiultra99:
Mitch,

So what your saying is, RXP for Havasu and 15F for Wildwood, NJ?

No,I'm saying that my stock RXP will out run a 15F off the line every time I even won off the line in limited with the triple pipers.I won both World titles this year.They don't have a chance with my 73.6 boat.The handling is an issue but I have worked on that.Once in front it is hard to pass.There is no reliablity issue because I did supercourse on both of ky RXP's too.